AD carry + Support Synergy

Something that at least slightly counters blitz's grabs for free (which nothing else does besides maybe a Yorick support and those ghouls aren't free) counts as a counter to me. Free way to give vision of the bush, shield the carry, and slow blitz and the enemy carry which will effectively nullify his Overdrive (Dissonance is more at every rank).

Please tell me what is a counter to him if Orianna isn't?

Sight in general? Orianna can just work since she has a "free" ward that doubles as a shield. Otherwise dropping a ward in a brush works just as well.

EDIT: I get what you're saying, but it's just sight in general that diminishes Blitz's value. A Janna with sight wards could do the same thing. :/